1 /*-
2 * Copyright (c) 2017 Juniper Networks. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26 #include <errno.h>
27 #include <stddef.h>
28 #include <stdint.h>
29 #include <string.h>
30 #include "libc_private.h"
31
32 /* ISO/IEC 9899:2011 K.3.7.4.1 */
33 errno_t
memset_s(void * s,rsize_t smax,int c,rsize_t n)34 memset_s(void *s, rsize_t smax, int c, rsize_t n)
35 {
36 errno_t ret;
37 rsize_t lim;
38 unsigned char v;
39 volatile unsigned char *dst;
40
41 ret = EINVAL;
42 lim = n < smax ? n : smax;
43 v = (unsigned char)c;
44 dst = (unsigned char *)s;
45 if (s == NULL) {
46 __throw_constraint_handler_s("memset_s : s is NULL", ret);
47 } else if (smax > RSIZE_MAX) {
48 __throw_constraint_handler_s("memset_s : smax > RSIZE_MAX",
49 ret);
50 } else if (n > RSIZE_MAX) {
51 __throw_constraint_handler_s("memset_s : n > RSIZE_MAX", ret);
52 } else {
53 while (lim > 0)
54 dst[--lim] = v;
55 if (n > smax) {
56 __throw_constraint_handler_s("memset_s : n > smax",
57 ret);
58 } else {
59 ret = 0;
60 }
61 }
62 return (ret);
63 }
64